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(No Model.)

J. H. SAUNDERS. SMOKE GONSUMER.

No. 593,860. Patented Nov. 16, 1897.

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lnventol UNITED STATES PATENT @rrrcs.

JOHN H. SAUNDERS, OF BUFFALO, NEW YORK, ASSIGNOR OF ONE-HALF TO JOHN A. HYLE, OF SAME PLACE.

SMOKE-CONSUMER.

SPECIFICATION formingpart of Letters Patent No. 593,860, dated November 16, 1897. Application filed May 12,1897. Serial No. 636,160. (No model.)

To all whom it may concern:

Be it known that 1, JOHN H. SAUNDERS, a citizen ofthe United States, residing at Buffalo, in the county of Erie and State of New York, have invented certain new and useful Improvements in Smoke-Consumers; andIdo hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in the object of my invention is the effectiveconsumption of whatever'smoke is produced by the introduction of fresh fuel, by raking I the fire, or from any other cause. I do not employ any elements in my improved device which are not now well known in smoke-consumers at present in use, my object'being toward diagonal direction against the inner vertical face of the bridge-wall and a series of passages through the front wall of the furnace on each side and below the perforated horizontal steam-pipe for admitting a divided current of air to the furnace on each side thereof and in close proximity to the fuel.

I will now minutely describe the manner in closing the same when not in use.

which I have carried out my invention and then claim what I believe to be novel.

In the drawings, Figure 1 is a central longitudinal vertical section of the furnace, showing the application of my improved smoke-consuming device. Fig. 2 is a've'rtical transverse section taken on the line m 00 of Fig. 1 and showing the inner face of the front wall of the furnace, and Fig. 3 is a horizontal section taken on the line 1 y of Fig. 2.

Referring to the drawings, 1 is the boiler. 2 is its steam chamber or dome. V

3 is the front wall of the furnace, containing the fire-box door 4 and ash-pit door 5. a 6 are the grate-bars, and '7 is the bridgewall. In a horizontal recess 8, located centrally in the inner face of the front wall 3 of the furnace and j u-st over the fire-box door 4, is placed a horizontal pipe consisting of the two sections 9 9 in screw-threaded engagement with the T-joint 10. Leading from the T-joint 10 and passing through and out of the front wall 3 is the steam-pipe 11, provided with the petcock 12. A vertical extension 13 of the pipe 11 is provided with the valve 14, and 15 is a horizontal extension of pipe 13 and leads'to and into the dome 2 of the boiler 1.

Thehorizontalpipe-sections 9 9 are each provided with a series of fine perforations 16,

preferably one-sixteenth of an inch in diam: eter and so located as to project the fine jets of steam escaping therefrom against the inner vertical face 17 of the bridge-wall and in a downward diagonal direction across the furnace, as clearly shown in Fig. 1. e

In the spaces in the front wall 3, between the ends of the fire-box door 4 and the side walls 18 18, are the series 19 19 of passages 20, formed by passing pipes entirely through the front wall 3 in a horizontal direction, their inner ends opening into the furnace below the horizontal perforated sections 9 9 and just above the bed of fuel. These passages are preferably four in number on each side and have their outer projecting ends provided with the screw-threaded caps 21 for I preferably provide a series of these passages 20 for the purpose of dividing the current of air admittedtherethrough to the furnace and thereby insuring a thorough superheating of the air before it is discharged over the fire, as the front wall necessarily becomes extremely hot while steam is being generated and consequently superheats the air as it is drawn through the passages 20 by the natural draft of the furnace.

In operation by opening the valve 14 in the feed-pipe 13 a horizontal series of steam-jets 22 are projected downwardly in a diagonal direction across the furnace and against the inner vertical face 17 of the bridge-wall 7, preferably as low down as the fuel will admit. The steam so projected is thrown back after its impact with the bridge-wall, producin g a back current over the upper face of the fire. The caps 21 are at the same time removed from over the passages 20 on each side of the furnace-door 4: and the air rushes in through them, forming a divided current 23 on each side of the furnace. The back current of steam coming in contact with the currents 23 of air on each side of the furnace produces rotary longitudinal current in each side of the furnace, as clearly indicated by the arrows in Figs. 1 and 2, the two rotary currents moving in opposite directions, coming together above and separating below, as indicated in Fig. 2. In this manner the smoke particles are picked up from the face of the fuel and whirled around in repeated contact with the fire until they are entirely consumed and pass out of the furnace above the rotary currents in the form of invisible gases. The effect of these rotary currents just described is to hold back all the smoke particles from passing unconsumed over the bridge-wall without in the least disturbing the efficiency of the draft.

I preferably place the perforated sections 9 9 within the recess 8 in the front wall to prevent the burning out of these pipes by the intense heat of the furnace, which is so fatal to the life of many of the devices now in use.

The number and size of the perforations 16 16 in the sections 9 9, as well as the numher and size of the air-passages 20, must be regulated to meet the requirements of furnaces varying in fuel capacity.

I am aware that the employment of steam and air in smoke-consumers of varied constructions is well known and that the use of each of my devices per Se is not novel; but I am not aware that these same devices have been arranged and combined in the novel manner herein shown and claimed for producing the rotary currents in each side of the furnace, moving in opposite directions and picking up the smoke particles and whirling them around in repeated contact with the fire until they are entirely consumed and pass out of the furnace above the rotary currents in the form of invisible gases.

I claim A smoke-consumer consisting essentially of a horizontal pipe centrally arranged in the upper part of the furnace within or next to its front wall and provided throughout its length with a series of fine perforations, for discharging jets of steam in a downward diagonal direction against the inner vertical face of the bridge-wall for producing a back current and a series of passages through the front wall of the furnace on each side thereof and below the perforated horizontal steampipe for admitting a divided current of air to the furnace on each side thereof and in close proximity to the fuel to produce in conjunction with the back current a rotary longitudinal current in each side of the furnace, the two rotary currents moving in opposite directions, all operating in the manner and for the purpose stated.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN II. SAUNDERS. Vitnesses:

E. MONTAGUE O. WILKINs, V. T. MILLER. 

